US20030027582A1 - Radio communication terminal unit and method of transmitting location information - Google Patents
Radio communication terminal unit and method of transmitting location information Download PDFInfo
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- US20030027582A1 US20030027582A1 US10/186,713 US18671302A US2003027582A1 US 20030027582 A1 US20030027582 A1 US 20030027582A1 US 18671302 A US18671302 A US 18671302A US 2003027582 A1 US2003027582 A1 US 2003027582A1
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- United States
- Prior art keywords
- location information
- radio communication
- information
- terminal unit
- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/09—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing processing capability normally carried out by the receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/252—Employing an initial estimate of location in generating assistance data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/0236—Assistance data, e.g. base station almanac
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
Definitions
- the present invention relates to a radio communication terminal unit, which receives location information and sends it to a location information server, a computer program which is run by a radio communication terminal unit, and a method of transmitting location information.
- a specifying location system which detects the locations of radio communication terminal units, e.g., cellular phone units, performs based on the IS (Interim Standard) 801 protocol.
- the sequential operations implemented under IS 801 protocol is shown in FIG. 8.
- a cellular phone unit 1 is instructed by the user to find its location. It makes access to nearby base stations thereby to get base station information of these base stations (step 101 ), transmits the base station information to a location information server 15 , and requests the server to release assistant information useful for the access to GPS (Global Positioning System) satellites.
- GPS Global Positioning System
- the location information server 15 upon receiving the base station information from the cellular phone unit 1 , specifies or determines the approximate location of the phone unit based on the received base station information, and it responds to the request of assistant information to compute assistant information useful for the cellular phone unit to make access to GPS satellites and send the computed assistant information to the phone unit 1 (step 151 ).
- the cellular phone unit 1 upon receiving the assistant information from the location information server ( 15 ), makes access to GPS satellites based on the assistant information thereby to get GPS satellite information of the GPS satellites, makes access to the base stations again to get their base station information again, sends the obtained GPS satellite information and base station information to the location information server, and requests the server to release the specified location.
- the location information server 15 receives the GPS satellite information, base station information and request of specifying location from the cellular phone unit 1 , detects the location of phone unit based on the received information, and sends the specified location to the phone unit 1 (step 152 ).
- This system enables the cellular phone unit 1 to make access to GPS satellites based on the assistant information provided by the location information server 15 , instead of having to keep almanac information by itself. It is advantageous for the whole system to minimize the time before the start of location specifying operation and also advantageous for each cellular phone unit to reduce its overhead operation based on the reliance of location specifying operation on the location information server.
- the cellular phone unit 1 sends to the location information server 15 all of GPS satellite information resulting from the access to GPS satellites and base station information resulting from the access to base stations. Therefore, it is likely that information which is unnecessary or even detrimental for the location specifying operation to the location information server 15 is sent. In this case, the location information server 15 might not be able to detect the location of phone unit accurately. Another drawback is a considerable communication toll and time imposed on the transmission of GPS satellite information and base station information.
- a radio communication terminal unit receives a transmission condition from an outside such as a location information server and acquires location information.
- the radio communication terminal unit extracts a part of the location information that meets the transmission condition out of the obtained location information. Only the extracted location information is sent to the location information server.
- FIG. 1 is a block diagram showing a radio communication system and a cellular phone unit according to first embodiment of this invention
- FIG. 2 is a flow diagram showing the sequential operations for specifying location according to the first embodiment
- FIGS. 3A and 3B are tables showing examples of transmission conditions in the first embodiment
- FIGS. 4A and 4B are tables showing examples of transmission conditions in the first embodiment
- FIG. 5 is a flow diagram showing the sequential operations for specifying location according to a second embodiment of this invention.
- FIG. 6 is a diagram showing an example of display on the cellular phone unit in the second embodiment
- FIG. 7 is a table showing an example of the correspondence between the toll/time levels and the transmission conditions in the second embodiment.
- FIG. 8 is a flow diagram showing the sequential operations for specifying location according to a related art.
- a cellular phone unit 1 includes a CPU (central processing unit) 2 , a GPS (global positioning system) communication device 4 which transacts the GPS radio wave signals with GPS satellites 3 , a CDMA (code division multiple access) communication device 5 for implementing the telephone operation based on the CDMA scheme, an audio processor 8 which deals with a voice signal entered by a microphone 6 and a voice signal to be released by a speaker 7 , a key set 9 with its set of communication start key, communication end key and numeric keys, a liquid crystal display panel 10 which displays the date and time and telephone number, and a memory 11 which includes RAM (random access memory) and ROM (read only memory).
- RAM random access memory
- ROM read only memory
- the cellular phone unit 1 gets GPS satellite information from GPS satellites 3 and base station information from base stations 12 , and sends the obtained information to the base stations 12 and to the location information server 15 via the base station control facility 13 and CDMA telephone network 14 .
- the location information server 15 receives GPS satellite information and base station information from the cellular phone unit 1 , and operates to detect the location of the phone unit 1 based on the received information.
- a contents server 16 sends contents data of application programs, e.g., games and map display, to the cellular phone unit 1 via the CDMA telephone network 14 , base station control facility 13 and base stations 12 .
- the phone unit 1 runs the application program by using the received contents data so that a game picture or map is displayed on the display panel 10 .
- a user operates the key set 9 of cellular phone unit 1 to instruct the start of specifying location.
- the CPU 2 responds to the user's instruction and operates on the CDMA communication device 5 to make access to base stations 12 thereby to get their base station information (step 101 ), and further operates on the CDMA communication device 5 to send the obtained base station information to the location information server 15 and request the server to release assistant information useful for the access to GPS satellites 3 .
- the location information server 15 receives the base station information from the cellular phone unit 1 , and determines the approximate location of the phone unit 1 based on the base station information. It also receives the request of assistant information and computes assistant information useful for the phone unit 1 to make access to GPS satellites 3 .
- the location information server 15 further sets a transmission condition for GPS satellites 3 and a transmission condition for base stations 12 (step 151 ). Specifically, the location information server 15 determines the approximate location of the cellular phone unit 1 based on the base station information provided by the phone unit 1 , and selects GPS satellites as subjects of access by the phone unit 1 , e.g., eleven GPS satellites # 1 , # 4 , # 7 , # 9 , # 10 , # 12 , # 15 , # 19 , # 20 , # 21 and # 23 as shown in the table of FIG. 3A.
- the location information server 15 compares the elevation angles and azimuths of the selected GPS satellites to designate proper GPS satellites, e.g., five proper GPS satellites # 1 , # 7 , # 15 , # 19 and # 21 , and sets a transmission condition so that the cellular phone unit 1 sends GPS satellite information of the five proper GPS satellites.
- the transmission condition may include the GPS satellite numbers.
- the location information server 15 selects base stations as subjects of access by the phone unit 1 based on the approximate location of the phone unit 1 , e.g., seven base stations # 262 , # 72 , # 92 , # 188 , # 184 , # 266 and # 80 as shown in the table of FIG. 3B.
- the location information server 15 compares the azimuths (positional relation with the phone unit 1 ) of the seven base stations to designate proper base stations e.g., four proper base stations # 262 , # 92 , # 188 and # 266 , and sets a transmission condition so that the cellular phone unit 1 sends base station information of the four proper base stations.
- the transmission condition may include the base station numbers.
- the location information server 15 sends the established transmission condition for the GPS satellites 3 and transmission condition for the base stations 12 to the cellular phone unit 1 , and also sends the computed assistant information to the phone unit 1 .
- the CPU 2 detects the receiving by the CDMA communication device 5 of the transmission condition for GPS satellites 3 and transmission condition for base stations 12 from the location information server 15 and also detects the receiving by the CDMA communication device 5 of the assistant information from the location information server 15 , operates on the GPS communication device 4 to make access to GPS satellites based on the received assistant information thereby to get GPS satellite information, and operates on the CDMA communication device 5 to make access to base stations 12 again thereby to get base station information of the base stations again.
- the CPU 2 extracts GPS satellite information that meets the transmission condition provided by the location information server 15 out of the obtained GPS satellite information, and also extracts base station information that meets the transmission condition provided by the location information server 15 out of the obtained base station information (step 102 ).
- the CPU 2 gets GPS satellite information of the 11 GPS satellites # 1 , # 4 , # 7 , # 9 , # 10 , # 12 , # 15 , # 19 , # 20 , # 21 and # 23 based on the assistant information provided by the location information server 15 , and extracts GPS satellite information of the five GPS satellites # 1 , # 7 , # 15 , # 19 and # 21 out of the obtained GPS satellite information based on the transmission condition provided by the location information server 15 .
- the CPU 2 operates on the CDMA communication device 5 to make access to base stations 12 thereby to get base station information of the seven base stations # 262 , # 72 , # 92 , # 188 , # 184 , # 266 and # 80 , and extracts base station information of the four base stations # 262 , # 92 , # 188 and # 266 out of the obtained base station information based on the transmission condition provided by the location information server 15 .
- the CPU 2 operates on the CDMA communication device 5 to send to the location information server 15 the GPS satellite information and base station information extracted based on the transmission conditions, and request the server to release the specified location.
- the cellular phone unit 1 extracts GPS satellite information and base station information that meet the transmission conditions provided by the location information server 15 out of the obtained GPS satellite information and base station information and sends the extracted information to the location information server 15 , instead of sending all of the obtained GPS satellite information and base station information to the location information server 15 .
- the location information server 15 receives the GPS satellite information and base station information from the cellular phone unit 1 and also receives the request of the release of the specified location from the phone unit 1 , specifies the location of the phone unit 1 based on the received GPS satellite information and base station information, and sends the specified location to the phone unit 1 (step 152 ).
- the foregoing system is designed such that the location information server 15 selects GPS satellite information to be sent from the cellular phone unit 1 based on the comparison of elevation angles and azimuths among the 11 GPS satellites which are accessible by the phone unit 1 and selects base station information to be sent from the phone unit 1 based on the comparison of azimuths among the seven base stations which are accessible by the phone unit 1 .
- the location information server 15 sets the threshold value of receiving power level to be 35 dB and the threshold value of phase difference variation to be 50 m for GPS satellite signals, and then the cellular phone unit 1 extracts GPS satellite information that meets the signal receiving power level of 35 dB or more and the signal phase difference variation of 50 m or less out of the obtained GPS satellite information, and sends the extracted information to the location information server 15 .
- the location information server 15 sets the threshold value of signal-to-noise ratio to be ⁇ 15 dB and the threshold value of phase difference variation to be 150 m for base station signals.
- the cellular phone unit 1 extracts base station information that meets the signal-to-noise ratio of ⁇ 15 dB or more and the signal phase difference variation of 150 m or less out of the obtained base station information, and sends the extracted information to the location information server 15 .
- the transmission condition for GPS satellites may be either a signal receiving power level of 35 dB or more or signal phase difference variation of 50 m or less.
- the transmission condition for base stations may be either a signal-to-noise ratio of ⁇ 15 dB or more or a signal phase difference variation of 150 m or less.
- the system may be designed such that the location information server 15 has a learning function so that it processes statistically transmission conditions which have been sent to the cellular phone unit 1 in the past and GPS satellite information and base station information which have been received from the phone unit 1 in the past and sends transmission conditions which are derived from the statistical process result to the phone unit 1 .
- the cellular phone unit 1 gets GPS satellite information and base station information, extracts GPS satellite information and base station information that meet the transmission conditions provided by the location information server 15 , and sends the extracted GPS satellite information and base station information to the location information server 15 .
- the cellular phone unit 1 receives the condition for the accurate determination of phone unit location by the location information server 15 in the form of transmission conditions, and extracts proper GPS satellite information and base station information to be sent to the location information server 15 , instead of sending all of the obtained GPS satellite information and base station information. In consequence, the communication toll and time expended for the transmission of GPS satellite information and base station information can be reduced.
- the location information server 15 receives only proper GPS satellite information and proper base station information from the phone unit 1 , and determines the location of phone unit 1 based solely on the received proper GPS satellite information and base station information. In consequence, the location of phone unit 1 can be specified accurately, and the system is enhanced in reliability.
- the location information server 15 sends the transmission conditions as shown in the tables of FIGS. 3A and 3B to the cellular phone unit 1 , it is not necessary for the phone unit 1 to make determination by itself on the extraction of GPS satellite information for each GPS satellite 3 and on the extraction of base station information for each base station 12 , but the determination is done by the location information server 15 , and the cellular phone unit 1 can lighten the overhead operation accordingly.
- the phone unit 1 makes determination on the extraction of GPS satellite information for each GPS satellite 3 based on the comparison of receiving power level and phase difference variation of GPS satellite signal with their threshold values and on the extraction of base station information for each base station 12 based on the comparison of signal-to-noise ratio and phase difference variation of base station signal with their threshold values thereby to select by itself proper GPS satellites and base stations.
- the location information server 15 can lighten the operation accordingly.
- the second embodiment of this invention will be explained with reference to FIG. 5 through FIG. 7. The following explains only portions different from the first embodiment.
- this embodiment is designed such that a user of cellular phone unit 1 sets a transmission condition and the phone unit 1 sends GPS satellite information and base station information that meet the transmission condition to the location information server 15 .
- the user Prior to the instruction of start of specifying location to the cellular phone unit 1 , the user instructs a transmission condition. Specifically, the user opens the toll & time selection screen shown in FIG. 6 on the display panel 10 of phone unit 1 and specifies a transmission condition from among level-1, level-2, level-3 and level-4. These levels represent transmission conditions of GPS satellite information and base station information as shown in the table of FIG. 7 for example.
- the CPU 2 detects the instruction of start of specifying location by the user on the keyboard 9 and operates on the CDMA communication device 5 to make access to base stations 12 thereby to get base station information of base stations 12 which are accessible by the phone unit 1 .
- the CPU 2 operates on the CDMA communication device 5 to send transmission condition setup signal indicative of the setting of transmission condition to the location information server 15 .
- the CPU 2 operates on the CDMA communication device 5 to send the obtained base station information to the location information server 15 and request the server 15 to release assistant information useful for the phone unit 1 to make access to GPS satellites 3 .
- the location information server 15 upon receiving the transmission condition setup signal and base station information from the cellular phone unit 1 , determines the approximate location of the phone unit 1 based on the received base station information. It responds to the request of assistant information to compute assistant information useful for the phone unit 1 to make access to GPS satellites and send the computed assistant information to the phone unit 1 .
- the CPU 2 upon detecting the receiving of assistant information from the location information server 15 , operates on the GPS communication device 4 to make access to GPS satellites 3 based on the received assistant information thereby to get GPS satellite information of the GPS satellites 3 and operates on the CDMA communication device 5 to make access to base stations 12 again thereby get base station information of the base stations 12 .
- the CPU 2 extracts GPS satellite information that meets the setup transmission condition out of the obtained GPS satellite information, and also extracts base station information that meets the setup transmission condition out of the obtained base station information.
- the CPU 2 does not extract GPS satellite information, but extracts base station information of the base stations 12 with the upper three largest signal-to-noise ratios (S/N).
- the CPU 2 extracts GPS satellite information of the GPS satellites 3 with the upper three largest receiving power levels and extracts base station information of the base stations 12 with the upper two largest signal-to-noise ratios.
- the CPU 2 extracts GPS satellite information of the GPS satellites 3 with receiving signal power levels of 30 dB or more and with phase difference variations of 70 m or less, and extracts base station information with signal-to-noise ratios of ⁇ 20 dB or more and with phase difference variations of 150 m or less.
- the CPU 2 takes all GPS satellite information and takes all base station information.
- the CPU 2 operates on the CDMA communication device 5 to send the GPS satellite information and base station information, which have been extracted based on the transmission condition, to the location information server 15 and request the release of the specified location.
- the cellular phone unit 1 extracts GPS satellite information and base station information that meet the transmission condition set by the user out of the obtained GPS satellite information and base station information and sends the extracted information to the location information server 15 , instead of sending all of the obtained GPS satellite information and base station information to the location information server 15 .
- the cellular phone unit 1 sends a minimal amount of information, which is solely base station information without GPS satellite information, to the location information server 15 .
- the cellular phone unit 1 sends a maximal amount of information, which is all of the obtained GPS satellite information and base station information, to the location information server 15 .
- the location information server 15 upon receiving the GPS satellite information and base station information and receiving the request of specifying location from the cellular phone unit 1 , determines the location of phone unit 1 based on the received GPS satellite information and base station information and sends the specified location to the phone unit 1 .
- the cellular phone unit 1 gets the GPS satellite information and base station information, extracts GPS satellite information and base station information that meet the transmission condition set by the user, and sends the extracted GPS satellite information and base station information to the location information server 15 .
- the cellular phone unit 1 can minimize the amount of information including GPS satellite information and base station information to be sent to the location information server 15 and thus can reduce the communication toll and time.
- the communication toll and time for sending GPS satellite information and base station information can be reduced.
- the radio communication terminal can be a portable information terminal unit or other communication terminal unit, besides a cellular phone unit.
- the cellular phone unit may have a learning function so that an optimal threshold value of transmission condition is determined automatically.
- the number of GPS satellites and the number of base stations in the transmission conditions of level-1 and level-2 are arbitrary.
- the second embodiment may be applied to a system in which the cellular phone unit specifies the location by itself based on the GPS satellite information and base station information, besides the foregoing system design in which the location information server specifies the location of cellular phone unit based on the GPS satellite information and base station information sent from the phone unit.
- the user sets a location specifying condition, and the cellular phone unit extracts GPS satellite information and base station information that meet the condition out of the obtained GPS satellite information and base station information and specifies the location based solely on the extracted information.
- the cellular phone unit which receives assistant information from the location information server may get only GPS satellite information based on the assistant information and sends to the location information server, besides the foregoing scheme of getting and sending both of GPS satellite information and base station information.
- the computer program which is run by the CPU of cellular phone unit may be down-loaded from a certain server via the telephone network or may be transferred from a CD-ROM (compact disk read only memory) or magnetic card into the memory of phone unit, besides the provision in a ROM at the manufacturing of phone unit.
- CD-ROM compact disk read only memory
Abstract
Description
- This application is based on and incorporates herein by reference Japanese Patent Application No. 2001-237839 filed on Aug. 6, 2001.
- The present invention relates to a radio communication terminal unit, which receives location information and sends it to a location information server, a computer program which is run by a radio communication terminal unit, and a method of transmitting location information.
- A specifying location system which detects the locations of radio communication terminal units, e.g., cellular phone units, performs based on the IS (Interim Standard) 801 protocol. The sequential operations implemented under IS 801 protocol is shown in FIG. 8.
- As shown in FIG. 8, a
cellular phone unit 1 is instructed by the user to find its location. It makes access to nearby base stations thereby to get base station information of these base stations (step 101), transmits the base station information to alocation information server 15, and requests the server to release assistant information useful for the access to GPS (Global Positioning System) satellites. - The
location information server 15, upon receiving the base station information from thecellular phone unit 1, specifies or determines the approximate location of the phone unit based on the received base station information, and it responds to the request of assistant information to compute assistant information useful for the cellular phone unit to make access to GPS satellites and send the computed assistant information to the phone unit 1 (step 151). - The
cellular phone unit 1, upon receiving the assistant information from the location information server (15), makes access to GPS satellites based on the assistant information thereby to get GPS satellite information of the GPS satellites, makes access to the base stations again to get their base station information again, sends the obtained GPS satellite information and base station information to the location information server, and requests the server to release the specified location. - The
location information server 15 receives the GPS satellite information, base station information and request of specifying location from thecellular phone unit 1, detects the location of phone unit based on the received information, and sends the specified location to the phone unit 1 (step 152). - This system enables the
cellular phone unit 1 to make access to GPS satellites based on the assistant information provided by thelocation information server 15, instead of having to keep almanac information by itself. It is advantageous for the whole system to minimize the time before the start of location specifying operation and also advantageous for each cellular phone unit to reduce its overhead operation based on the reliance of location specifying operation on the location information server. - In regard to the above sequential operations, the
cellular phone unit 1 sends to thelocation information server 15 all of GPS satellite information resulting from the access to GPS satellites and base station information resulting from the access to base stations. Therefore, it is likely that information which is unnecessary or even detrimental for the location specifying operation to thelocation information server 15 is sent. In this case, thelocation information server 15 might not be able to detect the location of phone unit accurately. Another drawback is a considerable communication toll and time imposed on the transmission of GPS satellite information and base station information. - In view of the foregoing situation, it is an object of the present invention to provide a radio communication terminal unit, a computer program, and a method of transmitting location information which all enable the transmission of proper location information to the location information server, the reduction of communication toll and time for sending location information, and the enhancement of accuracy and reliability of specifying location for the radio communication terminal unit.
- According to the present invention, in a radio communication system, a radio communication terminal unit receives a transmission condition from an outside such as a location information server and acquires location information. The radio communication terminal unit extracts a part of the location information that meets the transmission condition out of the obtained location information. Only the extracted location information is sent to the location information server.
- The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings.
- FIG. 1 is a block diagram showing a radio communication system and a cellular phone unit according to first embodiment of this invention;
- FIG. 2 is a flow diagram showing the sequential operations for specifying location according to the first embodiment;
- FIGS. 3A and 3B are tables showing examples of transmission conditions in the first embodiment;
- FIGS. 4A and 4B are tables showing examples of transmission conditions in the first embodiment;
- FIG. 5 is a flow diagram showing the sequential operations for specifying location according to a second embodiment of this invention;
- FIG. 6 is a diagram showing an example of display on the cellular phone unit in the second embodiment;
- FIG. 7 is a table showing an example of the correspondence between the toll/time levels and the transmission conditions in the second embodiment; and
- FIG. 8 is a flow diagram showing the sequential operations for specifying location according to a related art.
- The first embodiment of this invention which is applied to a cellular phone unit will be explained with reference to FIG. 1 through FIG. 4.
- In FIG. 1, a
cellular phone unit 1 includes a CPU (central processing unit) 2, a GPS (global positioning system)communication device 4 which transacts the GPS radio wave signals withGPS satellites 3, a CDMA (code division multiple access) communication device 5 for implementing the telephone operation based on the CDMA scheme, anaudio processor 8 which deals with a voice signal entered by amicrophone 6 and a voice signal to be released by aspeaker 7, akey set 9 with its set of communication start key, communication end key and numeric keys, a liquidcrystal display panel 10 which displays the date and time and telephone number, and a memory 11 which includes RAM (random access memory) and ROM (read only memory). - The
cellular phone unit 1 gets GPS satellite information fromGPS satellites 3 and base station information frombase stations 12, and sends the obtained information to thebase stations 12 and to thelocation information server 15 via the basestation control facility 13 and CDMAtelephone network 14. Thelocation information server 15 receives GPS satellite information and base station information from thecellular phone unit 1, and operates to detect the location of thephone unit 1 based on the received information. - A
contents server 16 sends contents data of application programs, e.g., games and map display, to thecellular phone unit 1 via the CDMAtelephone network 14, basestation control facility 13 andbase stations 12. By receiving contents data from thecontents server 16, thephone unit 1 runs the application program by using the received contents data so that a game picture or map is displayed on thedisplay panel 10. - The sequential operations of the system will be explained with reference to FIG. 2, FIG. 3 and FIG. 4.
- A user operates the
key set 9 ofcellular phone unit 1 to instruct the start of specifying location. TheCPU 2 responds to the user's instruction and operates on the CDMA communication device 5 to make access tobase stations 12 thereby to get their base station information (step 101), and further operates on the CDMA communication device 5 to send the obtained base station information to thelocation information server 15 and request the server to release assistant information useful for the access toGPS satellites 3. - The
location information server 15 receives the base station information from thecellular phone unit 1, and determines the approximate location of thephone unit 1 based on the base station information. It also receives the request of assistant information and computes assistant information useful for thephone unit 1 to make access toGPS satellites 3. - The
location information server 15 further sets a transmission condition forGPS satellites 3 and a transmission condition for base stations 12 (step 151). Specifically, thelocation information server 15 determines the approximate location of thecellular phone unit 1 based on the base station information provided by thephone unit 1, and selects GPS satellites as subjects of access by thephone unit 1, e.g., elevenGPS satellites # 1, #4, #7, #9, #10, #12, #15, #19, #20, #21 and #23 as shown in the table of FIG. 3A. Thelocation information server 15 compares the elevation angles and azimuths of the selected GPS satellites to designate proper GPS satellites, e.g., five properGPS satellites # 1, #7, #15, #19 and #21, and sets a transmission condition so that thecellular phone unit 1 sends GPS satellite information of the five proper GPS satellites. The transmission condition may include the GPS satellite numbers. - The
location information server 15 selects base stations as subjects of access by thephone unit 1 based on the approximate location of thephone unit 1, e.g., sevenbase stations # 262, #72, #92, #188, #184, #266 and #80 as shown in the table of FIG. 3B. Thelocation information server 15 compares the azimuths (positional relation with the phone unit 1) of the seven base stations to designate proper base stations e.g., four properbase stations # 262, #92, #188 and #266, and sets a transmission condition so that thecellular phone unit 1 sends base station information of the four proper base stations. The transmission condition may include the base station numbers. - The
location information server 15 sends the established transmission condition for theGPS satellites 3 and transmission condition for thebase stations 12 to thecellular phone unit 1, and also sends the computed assistant information to thephone unit 1. - On the part of the
cellular phone unit 1, theCPU 2 detects the receiving by the CDMA communication device 5 of the transmission condition forGPS satellites 3 and transmission condition forbase stations 12 from thelocation information server 15 and also detects the receiving by the CDMA communication device 5 of the assistant information from thelocation information server 15, operates on theGPS communication device 4 to make access to GPS satellites based on the received assistant information thereby to get GPS satellite information, and operates on the CDMA communication device 5 to make access tobase stations 12 again thereby to get base station information of the base stations again. - The
CPU 2 extracts GPS satellite information that meets the transmission condition provided by thelocation information server 15 out of the obtained GPS satellite information, and also extracts base station information that meets the transmission condition provided by thelocation information server 15 out of the obtained base station information (step 102). - Specifically, for example, the
CPU 2 gets GPS satellite information of the 11GPS satellites # 1, #4, #7, #9, #10, #12, #15, #19, #20, #21 and #23 based on the assistant information provided by thelocation information server 15, and extracts GPS satellite information of the fiveGPS satellites # 1, #7, #15, #19 and #21 out of the obtained GPS satellite information based on the transmission condition provided by thelocation information server 15. TheCPU 2 operates on the CDMA communication device 5 to make access tobase stations 12 thereby to get base station information of the sevenbase stations # 262, #72, #92, #188, #184, #266 and #80, and extracts base station information of the fourbase stations # 262, #92, #188 and #266 out of the obtained base station information based on the transmission condition provided by thelocation information server 15. - The
CPU 2 operates on the CDMA communication device 5 to send to thelocation information server 15 the GPS satellite information and base station information extracted based on the transmission conditions, and request the server to release the specified location. Namely, thecellular phone unit 1 extracts GPS satellite information and base station information that meet the transmission conditions provided by thelocation information server 15 out of the obtained GPS satellite information and base station information and sends the extracted information to thelocation information server 15, instead of sending all of the obtained GPS satellite information and base station information to thelocation information server 15. - The
location information server 15 receives the GPS satellite information and base station information from thecellular phone unit 1 and also receives the request of the release of the specified location from thephone unit 1, specifies the location of thephone unit 1 based on the received GPS satellite information and base station information, and sends the specified location to the phone unit 1 (step 152). - The foregoing system is designed such that the
location information server 15 selects GPS satellite information to be sent from thecellular phone unit 1 based on the comparison of elevation angles and azimuths among the 11 GPS satellites which are accessible by thephone unit 1 and selects base station information to be sent from thephone unit 1 based on the comparison of azimuths among the seven base stations which are accessible by thephone unit 1. - Alternatively, it is possible to set a transmission condition in terms of the threshold values of receiving power level and phase difference variation of GPS satellite signals and set a transmission condition in terms of the threshold values of signal-to-noise ratio and phase difference variation of base station signals as shown in FIGS. 4A and 4B. These threshold values are determined based on the installation and environmental states of the
base stations 12 for example. - Specifically, for example, the
location information server 15 sets the threshold value of receiving power level to be 35 dB and the threshold value of phase difference variation to be 50 m for GPS satellite signals, and then thecellular phone unit 1 extracts GPS satellite information that meets the signal receiving power level of 35 dB or more and the signal phase difference variation of 50 m or less out of the obtained GPS satellite information, and sends the extracted information to thelocation information server 15. Thelocation information server 15 sets the threshold value of signal-to-noise ratio to be −15 dB and the threshold value of phase difference variation to be 150 m for base station signals. Then thecellular phone unit 1 extracts base station information that meets the signal-to-noise ratio of −15 dB or more and the signal phase difference variation of 150 m or less out of the obtained base station information, and sends the extracted information to thelocation information server 15. - Alternatively, the transmission condition for GPS satellites may be either a signal receiving power level of 35 dB or more or signal phase difference variation of 50 m or less. The transmission condition for base stations may be either a signal-to-noise ratio of −15 dB or more or a signal phase difference variation of 150 m or less.
- Still alternatively, the system may be designed such that the
location information server 15 has a learning function so that it processes statistically transmission conditions which have been sent to thecellular phone unit 1 in the past and GPS satellite information and base station information which have been received from thephone unit 1 in the past and sends transmission conditions which are derived from the statistical process result to thephone unit 1. - According to the foregoing first embodiment, the
cellular phone unit 1 gets GPS satellite information and base station information, extracts GPS satellite information and base station information that meet the transmission conditions provided by thelocation information server 15, and sends the extracted GPS satellite information and base station information to thelocation information server 15. Thecellular phone unit 1 receives the condition for the accurate determination of phone unit location by thelocation information server 15 in the form of transmission conditions, and extracts proper GPS satellite information and base station information to be sent to thelocation information server 15, instead of sending all of the obtained GPS satellite information and base station information. In consequence, the communication toll and time expended for the transmission of GPS satellite information and base station information can be reduced. - After that, the
location information server 15 receives only proper GPS satellite information and proper base station information from thephone unit 1, and determines the location ofphone unit 1 based solely on the received proper GPS satellite information and base station information. In consequence, the location ofphone unit 1 can be specified accurately, and the system is enhanced in reliability. - In case the
location information server 15 sends the transmission conditions as shown in the tables of FIGS. 3A and 3B to thecellular phone unit 1, it is not necessary for thephone unit 1 to make determination by itself on the extraction of GPS satellite information for eachGPS satellite 3 and on the extraction of base station information for eachbase station 12, but the determination is done by thelocation information server 15, and thecellular phone unit 1 can lighten the overhead operation accordingly. - In case the
location information server 15 sends the transmission conditions as shown in the tables of FIGS. 4A and 4B to thephone unit 1, thephone unit 1 makes determination on the extraction of GPS satellite information for eachGPS satellite 3 based on the comparison of receiving power level and phase difference variation of GPS satellite signal with their threshold values and on the extraction of base station information for eachbase station 12 based on the comparison of signal-to-noise ratio and phase difference variation of base station signal with their threshold values thereby to select by itself proper GPS satellites and base stations. Thelocation information server 15 can lighten the operation accordingly. - The second embodiment of this invention will be explained with reference to FIG. 5 through FIG. 7. The following explains only portions different from the first embodiment. In contrast to the first embodiment in which the
location information server 15 sends transmission conditions to thecellular phone unit 1, this embodiment is designed such that a user ofcellular phone unit 1 sets a transmission condition and thephone unit 1 sends GPS satellite information and base station information that meet the transmission condition to thelocation information server 15. - Prior to the instruction of start of specifying location to the
cellular phone unit 1, the user instructs a transmission condition. Specifically, the user opens the toll & time selection screen shown in FIG. 6 on thedisplay panel 10 ofphone unit 1 and specifies a transmission condition from among level-1, level-2, level-3 and level-4. These levels represent transmission conditions of GPS satellite information and base station information as shown in the table of FIG. 7 for example. - Following the setting of the transmission condition on the
cellular phone unit 1, theCPU 2 detects the instruction of start of specifying location by the user on thekeyboard 9 and operates on the CDMA communication device 5 to make access tobase stations 12 thereby to get base station information ofbase stations 12 which are accessible by thephone unit 1. TheCPU 2 operates on the CDMA communication device 5 to send transmission condition setup signal indicative of the setting of transmission condition to thelocation information server 15. TheCPU 2 operates on the CDMA communication device 5 to send the obtained base station information to thelocation information server 15 and request theserver 15 to release assistant information useful for thephone unit 1 to make access toGPS satellites 3. - The
location information server 15, upon receiving the transmission condition setup signal and base station information from thecellular phone unit 1, determines the approximate location of thephone unit 1 based on the received base station information. It responds to the request of assistant information to compute assistant information useful for thephone unit 1 to make access to GPS satellites and send the computed assistant information to thephone unit 1. - On the part of the
cellular phone unit 1, theCPU 2, upon detecting the receiving of assistant information from thelocation information server 15, operates on theGPS communication device 4 to make access toGPS satellites 3 based on the received assistant information thereby to get GPS satellite information of theGPS satellites 3 and operates on the CDMA communication device 5 to make access tobase stations 12 again thereby get base station information of thebase stations 12. - The
CPU 2 extracts GPS satellite information that meets the setup transmission condition out of the obtained GPS satellite information, and also extracts base station information that meets the setup transmission condition out of the obtained base station information. - Specifically, for the transmission condition of level-1, the
CPU 2 does not extract GPS satellite information, but extracts base station information of thebase stations 12 with the upper three largest signal-to-noise ratios (S/N). For the transmission condition of level-2, theCPU 2 extracts GPS satellite information of theGPS satellites 3 with the upper three largest receiving power levels and extracts base station information of thebase stations 12 with the upper two largest signal-to-noise ratios. - For the transmission condition of level-3, the
CPU 2 extracts GPS satellite information of theGPS satellites 3 with receiving signal power levels of 30 dB or more and with phase difference variations of 70 m or less, and extracts base station information with signal-to-noise ratios of −20 dB or more and with phase difference variations of 150 m or less. For the transmission condition of level-4, theCPU 2 takes all GPS satellite information and takes all base station information. - The
CPU 2 operates on the CDMA communication device 5 to send the GPS satellite information and base station information, which have been extracted based on the transmission condition, to thelocation information server 15 and request the release of the specified location. Namely, thecellular phone unit 1 extracts GPS satellite information and base station information that meet the transmission condition set by the user out of the obtained GPS satellite information and base station information and sends the extracted information to thelocation information server 15, instead of sending all of the obtained GPS satellite information and base station information to thelocation information server 15. - In one case of the setting of transmission condition at level-1, the
cellular phone unit 1 sends a minimal amount of information, which is solely base station information without GPS satellite information, to thelocation information server 15. In another case of the setting of transmission condition at level-4, thecellular phone unit 1 sends a maximal amount of information, which is all of the obtained GPS satellite information and base station information, to thelocation information server 15. - The
location information server 15, upon receiving the GPS satellite information and base station information and receiving the request of specifying location from thecellular phone unit 1, determines the location ofphone unit 1 based on the received GPS satellite information and base station information and sends the specified location to thephone unit 1. - According to the foregoing second embodiment, the
cellular phone unit 1 gets the GPS satellite information and base station information, extracts GPS satellite information and base station information that meet the transmission condition set by the user, and sends the extracted GPS satellite information and base station information to thelocation information server 15. Based on the setting of a transmission condition, thecellular phone unit 1 can minimize the amount of information including GPS satellite information and base station information to be sent to thelocation information server 15 and thus can reduce the communication toll and time. By setting such a transmission condition as to reduce the communication time, the communication toll and time for sending GPS satellite information and base station information can be reduced. Based on the setting of a transmission condition which is presumed to be appropriate for thelocation information server 15 to point the location ofcellular phone unit 1 accurately, it is also possible to send only proper GPS satellite information and base station information to thelocation information server 15. - The present invention is not confined to the foregoing embodiments, but the following variations or expansion are possible. The radio communication terminal can be a portable information terminal unit or other communication terminal unit, besides a cellular phone unit. The cellular phone unit may have a learning function so that an optimal threshold value of transmission condition is determined automatically. In regard to the second embodiment, the number of GPS satellites and the number of base stations in the transmission conditions of level-1 and level-2 are arbitrary.
- The second embodiment may be applied to a system in which the cellular phone unit specifies the location by itself based on the GPS satellite information and base station information, besides the foregoing system design in which the location information server specifies the location of cellular phone unit based on the GPS satellite information and base station information sent from the phone unit. In this case, the user sets a location specifying condition, and the cellular phone unit extracts GPS satellite information and base station information that meet the condition out of the obtained GPS satellite information and base station information and specifies the location based solely on the extracted information.
- The cellular phone unit which receives assistant information from the location information server may get only GPS satellite information based on the assistant information and sends to the location information server, besides the foregoing scheme of getting and sending both of GPS satellite information and base station information.
- The computer program which is run by the CPU of cellular phone unit may be down-loaded from a certain server via the telephone network or may be transferred from a CD-ROM (compact disk read only memory) or magnetic card into the memory of phone unit, besides the provision in a ROM at the manufacturing of phone unit.
Claims (15)
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JP2001237839A JP4049558B2 (en) | 2001-08-06 | 2001-08-06 | Wireless communication terminal, computer program, and position-related information transmission method |
JP2001-237839 | 2001-08-06 |
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FR2999857A1 (en) * | 2012-12-18 | 2014-06-20 | Fidzup | METHOD FOR LOCATING A TELECOMMUNICATIONS TERMINAL |
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JP3575451B2 (en) * | 2001-09-07 | 2004-10-13 | 株式会社デンソー | Mobile communication terminal device and its program |
JP2004159026A (en) * | 2002-11-06 | 2004-06-03 | Nec Access Technica Ltd | Mobile phone, positioning switching method used for same, and program thereof |
JP2005017015A (en) * | 2003-06-24 | 2005-01-20 | National Institute Of Information & Communication Technology | Location authentication system by satellite positioning, and satellite-positioning analysis server apparatus, satellite-positioning terminal apparatus |
JP2006090838A (en) * | 2004-09-24 | 2006-04-06 | Seiko Epson Corp | Positioning system, positioning apparatus, positioning information providing apparatus, positioning method, control program for positioning system, and computer-readable storage medium storing control program for positioning system |
US7860516B2 (en) | 2006-12-05 | 2010-12-28 | Microsoft Corporation | Automatic localization of devices |
US8121620B2 (en) | 2007-03-22 | 2012-02-21 | International Business Machines Corporation | Location tracking of mobile phone using GPS function |
US7831216B1 (en) | 2007-11-27 | 2010-11-09 | Sprint Spectrum L.P. | Mobile-station-assisted low-cost-internet-base-station-(LCIB) location determination |
US8417264B1 (en) | 2009-05-14 | 2013-04-09 | Spring Spectrum L.P. | Method and apparatus for determining location of a mobile station based on locations of multiple nearby mobile stations |
US8494566B2 (en) * | 2010-06-01 | 2013-07-23 | Microsoft Corporation | Hybrid mobile phone geopositioning |
CN102186143B (en) * | 2011-05-27 | 2015-01-07 | 北京百度网讯科技有限公司 | Method, mobile terminal and system for acquiring positioning information |
US9037109B1 (en) | 2012-03-02 | 2015-05-19 | Sprint Spectrum L.P. | Controlling billing for use of one system based on device location in other system |
US9622209B1 (en) | 2013-08-15 | 2017-04-11 | Sprint Spectrum L.P. | Alternative location source for low-cost internet base station systems when satellite-based positioning system coverage is unavailable |
CN109991637B (en) * | 2017-12-29 | 2021-06-18 | 中国电信股份有限公司 | Positioning method, positioning apparatus, and computer-readable storage medium |
CN110967718A (en) * | 2018-09-29 | 2020-04-07 | 奇酷互联网络科技(深圳)有限公司 | Positioning method, mobile terminal and storage medium |
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Also Published As
Publication number | Publication date |
---|---|
US6963749B2 (en) | 2005-11-08 |
CN1402443A (en) | 2003-03-12 |
JP4049558B2 (en) | 2008-02-20 |
KR20030014114A (en) | 2003-02-15 |
JP2003052064A (en) | 2003-02-21 |
CN100477560C (en) | 2009-04-08 |
KR100454530B1 (en) | 2004-11-03 |
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